If there is a flat rectangular channel with $1\mathrm{.}5$ m width, the discharge is $12\frac{m^3}{s}($both $$

and $$ are $1\mathrm{.}0)$ as shown in the figure below:

a

If the specific energy is $3$ m $,$ and without any energy loss. Please determine the

maximum $Z$ if the discharge is not affected.

b$.$

If water depth at cross section $1-1$ is $2\mathrm{.}46$ m $,$ and water depth at cross section $2-2$

is $1\mathrm{.}45$ m $,$ please determine the resistance force from the channel bottom and

the hump.